From b807819ea168bf3b0d01e3119aeefe0312499aa8 Mon Sep 17 00:00:00 2001
From: helmutm <helmutm@fd906abe-77d9-0310-91a1-e0d9ade77398>
Date: Sun, 19 Sep 2010 15:25:02 +0000
Subject: [PATCH] do not convert date values that are already a string

git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@4001 fd906abe-77d9-0310-91a1-e0d9ade77398
---
 composer/schema/field.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/composer/schema/field.py b/composer/schema/field.py
index ce06b16..0426396 100644
--- a/composer/schema/field.py
+++ b/composer/schema/field.py
@@ -235,6 +235,8 @@ class DateFieldInstance(NumberFieldInstance):
     def marshall(self, value):
         if value is None:
             return ''
+        if isinstance(value, basestring):
+            return value
         return strftime('%Y-%m-%dT%H:%M', value.timetuple())
 
     def display(self, value):